Lamp-ignition device.



O. KOCH.

LAMP IGNITION DEVICE.

APPLIOATION' FILED AUG. 30, 1909.

PatentedJaIL16,1912.

' j zzfaiz for (k/'Z Z0c/ 2/ $5 UNITED snares PATENT OFFICE.

CARL KOCH, 0F LINDEN-ON-THE-RUHR, GERMANY.

LAMP-IGNITION DEVICE.

Specification of Letters Patent.

. Patented Jan. 16, 191 2.

Application filed August 30, 1909. Sria1 No. 515,295.

To all whom it may concern:

Be it known that I, CARL Keen, a subject of the Emperor of Germany, and residing at Linden-on-the-Ruhr, Germany, have invented certain new anduset'ul Improvements in Lamp-Ignition Devices, of which the following is a specification.

In the case of miners lamps, the lighting of which is effected by pyrophorous metal, the non-burned particles which are rubbed off when lighting the lamp, andwemain in the interior of the lamp body, f rm a considerable danger in case of tire damp as the lamp falls down or is shaken, nd when they fall through the wire cage' hey can bring about an explosion of the fire-damp. In order to reduce this danger as much as possible, it is necessary to give the spark emitting alloys used for lighting such lamps,'as high a point of ignition as possible. But then again it is necessary that the friction for the ignition should be a v ry energetic one in order to insure getting a spark from such alloys and-to avoid sha vings being rubbed off without effecting ign ition.

Well known ignition or lighting devices have the drawback that the movement of the rubber depends on the speed with which the ignition device is operated. According to the present invention the movement of the rubber takes place independently of the hand movement by means of an intermediary portion the limit of travel of the rubber and its velocity always remaining the same.

In the accompanying drawings :Figure 1 is a sectional elevation of a spring operated lighting device. Fig. 2 is a sectional view taken at a right angle to the viewin Fig. 1. Fig. 3 is a sectional plan of the same device.

In the device illustrated the single portions of the ignition device are mounted on when the lamp gets hot, they. iglxite .when

a disk inserted in the casingof the lamp."

of the lamp. The pyrophorous alloy is arranged in the tube a and is pressed in the known manner by a spring f against the rubber c. The rubber c is laterally adjust able, it is held in its position by the spring and is provided with a projection To the spindle is secured a nut e which, on the spindle rotatingengages with the projection Y o'fthe rubber, moves the latter laterally and places the spring f in tension and during the subsequent turning, slides ofifrom the projection and again releases'the rubber. Owing to the action of the spring, the rubber is brought back into its original position and rubs otf little s avings from thep rophorous metal, which, owing to the quickness with which this movement is carried out, aie'ignited in a reliable manner. In order to enable the longest possible piece of pyrophorous metal to be put in, the tube is preferably mounted in the cover obliquely and is situated with its longer portion under the cover in the casing. The rubber is preferably made of dove-tailed shape at the holder and can be easily replaced by loosening the screw. In order to direct the sparks to the wick, itis preferable to make the teeth of the rubber obliquely, namely so that the vertical line of. the burner forms with the teeth a pointedangle converging at the bottom.

As pyrophoric substances can be used pyr phoric alloys, containing cerium alloyed with iron or such pyrophoric alloys which consist of magnesium, aluminium, and like metals alloyed with the so-called rare earth metals. especially with a mixture containing cerium, lanthanum and didymium metal.

WVhat I claim as my invention and desire to secure by Letters Patent is An ignition device for miners safety lamps, comprising, in combination, means for supporting a pyrophoric substance in operative position, a reciprocatory slide having a friction surface arranged to cooperate with said pyrophoric substance, a leaf spring lying in the plane of movement of said slide and acting thereon to move the latter in one direction, and a disk mounted revolubly beneath the plane of said slide and spring and having means for gradually In testimony whereof I have signed my retracting the slide againstthe action of name to this specification in the presence the spring and for suddenly leleasing the of two subscribing Witnesses.

slide to permit a quick motion of the slide CARL KOCH. under the action of the spring, the parts Witnesses:

being in flat compact form to enable the de- M. KNEPPERS, vice to be placed in a that box. LOUIS VANDORY. 

